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5dd11d5d47
The only way the debugger can handle a trap in inside rcu_lock, notify_die, or atomic_notifier_call_chain without a recursive fault is to have a low level "first opportunity handler" do_trap_or_bp() handler. Generally this will be something the vast majority of folks will not need, but for those who need it, it is added as a kernel .config option called KGDB_LOW_LEVEL_TRAP. Also added was a die notification for oops such that kdb can catch an oops for analysis. There appeared to be no obvious way to pass the struct pt_regs from the original exception back to the stack back tracer, so a special case was added to show_stack() for when kdb is active because you generally desire to generally look at the back trace of the original exception. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Acked-by: Ralf Baechle <ralf@linux-mips.org>
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#ifndef __ASM_KGDB_H_
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#define __ASM_KGDB_H_
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#ifdef __KERNEL__
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#include <asm/sgidefs.h>
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#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
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(_MIPS_ISA == _MIPS_ISA_MIPS32)
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#define KGDB_GDB_REG_SIZE 32
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#elif (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
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(_MIPS_ISA == _MIPS_ISA_MIPS64)
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#ifdef CONFIG_32BIT
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#define KGDB_GDB_REG_SIZE 32
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#else /* CONFIG_CPU_32BIT */
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#define KGDB_GDB_REG_SIZE 64
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#endif
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#else
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#error "Need to set KGDB_GDB_REG_SIZE for MIPS ISA"
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#endif /* _MIPS_ISA */
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#define BUFMAX 2048
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#if (KGDB_GDB_REG_SIZE == 32)
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#define NUMREGBYTES (90*sizeof(u32))
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#define NUMCRITREGBYTES (12*sizeof(u32))
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#else
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#define NUMREGBYTES (90*sizeof(u64))
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#define NUMCRITREGBYTES (12*sizeof(u64))
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#endif
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#define BREAK_INSTR_SIZE 4
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#define CACHE_FLUSH_IS_SAFE 0
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extern void arch_kgdb_breakpoint(void);
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extern int kgdb_early_setup;
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extern void *saved_vectors[32];
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extern void handle_exception(struct pt_regs *regs);
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extern void breakinst(void);
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extern int kgdb_ll_trap(int cmd, const char *str,
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struct pt_regs *regs, long err, int trap, int sig);
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#endif /* __KERNEL__ */
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#endif /* __ASM_KGDB_H_ */
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